ISLAMABAD, Pakistan (CNN) -- Pakistan's National Assembly unanimously adopted a resolution Monday calling for a United Nations probe into the assassination of former Prime Minister Benazir Bhutto.

The move is not surprising given that Pakistan's new government and parliament is dominated by a coalition led by Bhutto's Pakistan People's Party.

Party members and Bhutto's family have repeatedly called for such an investigation since she was killed December 27 after a campaign rally in Rawalpindi, south of the Pakistani capital of Islamabad.

The resolution calls for an international inquiry into the people behind the killing, the state-run Associated Press of Pakistan said.

Until now, President Pervez Musharraf has balked at calls for a United Nations inquiry. His government -- before it was ousted from power after parliamentary elections in February -- had contended that the killing was orchestrated by Baitullah Mehsud, who as leader of the Pakistani Taliban has ties to al Qaeda.

The CIA reached the same conclusion. But two nationwide polls conducted this year found that a majority of Pakistanis believe Musharraf's government was complicit in Bhutto's assassination.

The cause of Bhutto's death is not clear. Her family has refused to carry out an autopsy.